At present, strawberries in the Beijing suburbs have been listed on a large scale, but with the growth of strawberries and the harvesting of fruits, farmers neglected the application of trace fertilizers, combined with irrational use of fertilizers, resulting in the lack of trace elements required for strawberry growth, especially boron and iron. The lack of symptoms is particularly evident and has affected the yield and quality of strawberries.
Boron and iron deficiency symptoms
When the supply of boron and iron in the soil is insufficient, the growth and development of the strawberry will be affected. The strawberry also shows some specific special symptoms in the form, and it is also an external manifestation of the malnutrition in the body.
Boron deficiency: The early boron deficiency of strawberry shows young leaves appear shrinkage and leaf coke, the leaves are yellow, the growth point is damaged, the root is short and thick, dark, with the increase of boron deficiency, the old leaves of the veins between the chlorosis or The leaf curls upward. Boron-deficient plants have small flowers, low rates of pollination and seed setting, fruit deformities or tumors, small fruit seeds, and poor fruit quality. Boron-deficient soils and soils are susceptible to boron deficiency during drought.
Iron Deficiency: The first symptom of strawberry iron deficiency is yellowing or chlorosis of young leaves, which turns white with increasing degree of yellowing. When the strawberry is moderately iron-deficient, the veins are green and the veins are white-yellow; when the iron deficiency is severe, the newly grown lobule turns white, the leaf margins are necrotic, or the lobulars are yellow, and the leaf edges and veins become brown and necrotic. The iron-deficient strawberry plants had weak root growth. When the iron deficiency was severe, the single fruit weight decreased and the yield decreased. Alkaline soils or acidic soils are prone to iron deficiency.
The performance of strawberry boron and iron deficiency syndrome varies depending on the variety, temperature, soil, and cultivation techniques. However, the characteristics that are lacking for certain elements are basically the same, except that the symptoms appear sooner or later. The degree of harm will vary.
Control methods
According to the occurrence site and performance characteristics of strawberry boron and iron deficiency syndrome, symptomatic application can achieve good control effect.
Organic fertilizers are added: Organic fertilizers contain a large amount of trace elements such as boron and iron, which are an important nutrient recharge source for maintaining the fertility of soil trace elements. At the same time, applying organic fertilizers can regulate soil environmental conditions and increase soil Organic acids make boron, iron and other trace elements available, to increase the effectiveness of boron and iron in the soil, and to meet the needs of strawberry growth for boron and iron. It is recommended that 1000-1500 kg of organic fertilizer is applied to the production base of acre. Fertilizer-deficient areas must pay special attention to increasing the application of organic fertilizers.
Foliar application of boron fertilizer, iron fertilizer: strawberry 0.1% borax aqueous solution sprayed at flowering stage or young fruit stage, because strawberry is sensitive to excess boron, so the spraying concentration should be reduced appropriately; when strawberry plants show iron deficiency symptoms , Spray foliar spray of 0.1% ferrous sulfate or 0.03% iron chelate solution in time. Spraying time is 7-10 days at intervals. Continuous spraying 2-3 times. Select before 10 o'clock in the morning or in the afternoon. After spraying, to achieve the best effect.
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